This is a Rosin based Solder wire formulated for use with more difficult to solder applications and gives rapid solder wetting action and excellent solder spread, it particularly performs well on hard to solder parts and surfaces such as brass, oxidised copper, nickel and beryllium copper contacts. Typical use: Suitable for use in areas of industry such as white goods, toys and games and all types of electrical appliances, power supplies and many heavier electrical assemblies.